fs/gfs2/glops.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/gfs2_ondisk.h>
  15 #include <linux/lm_interface.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "bmap.h"
  20 #include "glock.h"
  21 #include "glops.h"
  22 #include "inode.h"
  23 #include "log.h"
  24 #include "meta_io.h"
  25 #include "recovery.h"
  26 #include "rgrp.h"
  27 #include "util.h"
  28 #include "trans.h"
  29
  30 /**
  31  * ail_empty_gl - remove all buffers for a given lock from the AIL
  32  * @gl: the glock
  33  *
  34  * None of the buffers should be dirty, locked, or pinned.
  35  */
  36
  37 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
  38 {
  39         struct gfs2_sbd *sdp = gl->gl_sbd;
  40         unsigned int blocks;
  41         struct list_head *head = &gl->gl_ail_list;
  42         struct gfs2_bufdata *bd;
  43         struct buffer_head *bh;
  44         u64 blkno;
  45         int error;
  46
  47         blocks = atomic_read(&gl->gl_ail_count);
  48         if (!blocks)
  49                 return;
  50
  51         error = gfs2_trans_begin(sdp, 0, blocks);
  52         if (gfs2_assert_withdraw(sdp, !error))
  53                 return;
  54
  55         gfs2_log_lock(sdp);
  56         while (!list_empty(head)) {
  57                 bd = list_entry(head->next, struct gfs2_bufdata,
  58                                 bd_ail_gl_list);
  59                 bh = bd->bd_bh;
  60                 blkno = bh->b_blocknr;
  61                 gfs2_assert_withdraw(sdp, !buffer_busy(bh));
  62
  63                 bd->bd_ail = NULL;
  64                 list_del(&bd->bd_ail_st_list);
  65                 list_del(&bd->bd_ail_gl_list);
  66                 atomic_dec(&gl->gl_ail_count);
  67                 brelse(bh);
  68                 gfs2_log_unlock(sdp);
  69
  70                 gfs2_trans_add_revoke(sdp, blkno);
  71
  72                 gfs2_log_lock(sdp);
  73         }
  74         gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
  75         gfs2_log_unlock(sdp);
  76
  77         gfs2_trans_end(sdp);
  78         gfs2_log_flush(sdp, NULL);
  79 }
  80
  81 /**
  82  * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock
  83  * @gl: the glock
  84  *
  85  */
  86
  87 static void gfs2_pte_inval(struct gfs2_glock *gl)
  88 {
  89         struct gfs2_inode *ip;
  90         struct inode *inode;
  91
  92         ip = gl->gl_object;
  93         inode = &ip->i_inode;
  94         if (!ip || !S_ISREG(inode->i_mode))
  95                 return;
  96
  97         if (!test_bit(GIF_PAGED, &ip->i_flags))
  98                 return;
  99
 100         unmap_shared_mapping_range(inode->i_mapping, 0, 0);
 101
 102         if (test_bit(GIF_SW_PAGED, &ip->i_flags))
 103                 set_bit(GLF_DIRTY, &gl->gl_flags);
 104
 105         clear_bit(GIF_SW_PAGED, &ip->i_flags);
 106 }
 107
 108 /**
 109  * meta_go_sync - sync out the metadata for this glock
 110  * @gl: the glock
 111  *
 112  * Called when demoting or unlocking an EX glock.  We must flush
 113  * to disk all dirty buffers/pages relating to this glock, and must not
 114  * not return to caller to demote/unlock the glock until I/O is complete.
 115  */
 116
 117 static void meta_go_sync(struct gfs2_glock *gl)
 118 {
 119         if (gl->gl_state != LM_ST_EXCLUSIVE)
 120                 return;
 121
 122         if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
 123                 gfs2_log_flush(gl->gl_sbd, gl);
 124                 gfs2_meta_sync(gl);
 125                 gfs2_ail_empty_gl(gl);
 126         }
 127 }
 128
 129 /**
 130  * meta_go_inval - invalidate the metadata for this glock
 131  * @gl: the glock
 132  * @flags:
 133  *
 134  */
 135
 136 static void meta_go_inval(struct gfs2_glock *gl, int flags)
 137 {
 138         if (!(flags & DIO_METADATA))
 139                 return;
 140
 141         gfs2_meta_inval(gl);
 142         gl->gl_vn++;
 143 }
 144
 145 /**
 146  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
 147  * @gl: the glock protecting the inode
 148  *
 149  */
 150
 151 static void inode_go_sync(struct gfs2_glock *gl)
 152 {
 153         struct gfs2_inode *ip = gl->gl_object;
 154
 155         if (ip && !S_ISREG(ip->i_inode.i_mode))
 156                 ip = NULL;
 157
 158         if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
 159                 if (ip && !gfs2_is_jdata(ip))
 160                         filemap_fdatawrite(ip->i_inode.i_mapping);
 161                 gfs2_log_flush(gl->gl_sbd, gl);
 162                 if (ip && gfs2_is_jdata(ip))
 163                         filemap_fdatawrite(ip->i_inode.i_mapping);
 164                 gfs2_meta_sync(gl);
 165                 if (ip) {
 166                         struct address_space *mapping = ip->i_inode.i_mapping;
 167                         int error = filemap_fdatawait(mapping);
 168                         mapping_set_error(mapping, error);
 169                 }
 170                 clear_bit(GLF_DIRTY, &gl->gl_flags);
 171                 gfs2_ail_empty_gl(gl);
 172         }
 173 }
 174
 175 /**
 176  * inode_go_xmote_th - promote/demote a glock
 177  * @gl: the glock
 178  * @state: the requested state
 179  * @flags:
 180  *
 181  */
 182
 183 static void inode_go_xmote_th(struct gfs2_glock *gl)
 184 {
 185         if (gl->gl_state != LM_ST_UNLOCKED)
 186                 gfs2_pte_inval(gl);
 187         if (gl->gl_state == LM_ST_EXCLUSIVE)
 188                 inode_go_sync(gl);
 189 }
 190
 191 /**
 192  * inode_go_xmote_bh - After promoting/demoting a glock
 193  * @gl: the glock
 194  *
 195  */
 196
 197 static void inode_go_xmote_bh(struct gfs2_glock *gl)
 198 {
 199         struct gfs2_holder *gh = gl->gl_req_gh;
 200         struct buffer_head *bh;
 201         int error;
 202
 203         if (gl->gl_state != LM_ST_UNLOCKED &&
 204             (!gh || !(gh->gh_flags & GL_SKIP))) {
 205                 error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);
 206                 if (!error)
 207                         brelse(bh);
 208         }
 209 }
 210
 211 /**
 212  * inode_go_drop_th - unlock a glock
 213  * @gl: the glock
 214  *
 215  * Invoked from rq_demote().
 216  * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
 217  * is being purged from our node's glock cache; we're dropping lock.
 218  */
 219
 220 static void inode_go_drop_th(struct gfs2_glock *gl)
 221 {
 222         gfs2_pte_inval(gl);
 223         if (gl->gl_state == LM_ST_EXCLUSIVE)
 224                 inode_go_sync(gl);
 225 }
 226
 227 /**
 228  * inode_go_inval - prepare a inode glock to be released
 229  * @gl: the glock
 230  * @flags:
 231  *
 232  */
 233
 234 static void inode_go_inval(struct gfs2_glock *gl, int flags)
 235 {
 236         struct gfs2_inode *ip = gl->gl_object;
 237         int meta = (flags & DIO_METADATA);
 238
 239         if (meta) {
 240                 gfs2_meta_inval(gl);
 241                 if (ip)
 242                         set_bit(GIF_INVALID, &ip->i_flags);
 243         }
 244
 245         if (ip && S_ISREG(ip->i_inode.i_mode)) {
 246                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
 247                 clear_bit(GIF_PAGED, &ip->i_flags);
 248         }
 249 }
 250
 251 /**
 252  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
 253  * @gl: the glock
 254  *
 255  * Returns: 1 if it's ok
 256  */
 257
 258 static int inode_go_demote_ok(struct gfs2_glock *gl)
 259 {
 260         struct gfs2_sbd *sdp = gl->gl_sbd;
 261         int demote = 0;
 262
 263         if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)
 264                 demote = 1;
 265         else if (!sdp->sd_args.ar_localcaching &&
 266                  time_after_eq(jiffies, gl->gl_stamp +
 267                                gfs2_tune_get(sdp, gt_demote_secs) * HZ))
 268                 demote = 1;
 269
 270         return demote;
 271 }
 272
 273 /**
 274  * inode_go_lock - operation done after an inode lock is locked by a process
 275  * @gl: the glock
 276  * @flags:
 277  *
 278  * Returns: errno
 279  */
 280
 281 static int inode_go_lock(struct gfs2_holder *gh)
 282 {
 283         struct gfs2_glock *gl = gh->gh_gl;
 284         struct gfs2_inode *ip = gl->gl_object;
 285         int error = 0;
 286
 287         if (!ip)
 288                 return 0;
 289
 290         if (test_bit(GIF_INVALID, &ip->i_flags)) {
 291                 error = gfs2_inode_refresh(ip);
 292                 if (error)
 293                         return error;
 294         }
 295
 296         if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
 297             (gl->gl_state == LM_ST_EXCLUSIVE) &&
 298             (gh->gh_state == LM_ST_EXCLUSIVE))
 299                 error = gfs2_truncatei_resume(ip);
 300
 301         return error;
 302 }
 303
 304 /**
 305  * inode_go_unlock - operation done before an inode lock is unlocked by a
 306  *                   process
 307  * @gl: the glock
 308  * @flags:
 309  *
 310  */
 311
 312 static void inode_go_unlock(struct gfs2_holder *gh)
 313 {
 314         struct gfs2_glock *gl = gh->gh_gl;
 315         struct gfs2_inode *ip = gl->gl_object;
 316
 317         if (ip)
 318                 gfs2_meta_cache_flush(ip);
 319 }
 320
 321 /**
 322  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
 323  * @gl: the glock
 324  *
 325  * Returns: 1 if it's ok
 326  */
 327
 328 static int rgrp_go_demote_ok(struct gfs2_glock *gl)
 329 {
 330         return !gl->gl_aspace->i_mapping->nrpages;
 331 }
 332
 333 /**
 334  * rgrp_go_lock - operation done after an rgrp lock is locked by
 335  *    a first holder on this node.
 336  * @gl: the glock
 337  * @flags:
 338  *
 339  * Returns: errno
 340  */
 341
 342 static int rgrp_go_lock(struct gfs2_holder *gh)
 343 {
 344         return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);
 345 }
 346
 347 /**
 348  * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
 349  *    a last holder on this node.
 350  * @gl: the glock
 351  * @flags:
 352  *
 353  */
 354
 355 static void rgrp_go_unlock(struct gfs2_holder *gh)
 356 {
 357         gfs2_rgrp_bh_put(gh->gh_gl->gl_object);
 358 }
 359
 360 /**
 361  * trans_go_xmote_th - promote/demote the transaction glock
 362  * @gl: the glock
 363  * @state: the requested state
 364  * @flags:
 365  *
 366  */
 367
 368 static void trans_go_xmote_th(struct gfs2_glock *gl)
 369 {
 370         struct gfs2_sbd *sdp = gl->gl_sbd;
 371
 372         if (gl->gl_state != LM_ST_UNLOCKED &&
 373             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 374                 gfs2_meta_syncfs(sdp);
 375                 gfs2_log_shutdown(sdp);
 376         }
 377 }
 378
 379 /**
 380  * trans_go_xmote_bh - After promoting/demoting the transaction glock
 381  * @gl: the glock
 382  *
 383  */
 384
 385 static void trans_go_xmote_bh(struct gfs2_glock *gl)
 386 {
 387         struct gfs2_sbd *sdp = gl->gl_sbd;
 388         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 389         struct gfs2_glock *j_gl = ip->i_gl;
 390         struct gfs2_log_header_host head;
 391         int error;
 392
 393         if (gl->gl_state != LM_ST_UNLOCKED &&
 394             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 395                 gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
 396                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 397
 398                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 399                 if (error)
 400                         gfs2_consist(sdp);
 401                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
 402                         gfs2_consist(sdp);
 403
 404                 /*  Initialize some head of the log stuff  */
 405                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 406                         sdp->sd_log_sequence = head.lh_sequence + 1;
 407                         gfs2_log_pointers_init(sdp, head.lh_blkno);
 408                 }
 409         }
 410 }
 411
 412 /**
 413  * trans_go_drop_th - unlock the transaction glock
 414  * @gl: the glock
 415  *
 416  * We want to sync the device even with localcaching.  Remember
 417  * that localcaching journal replay only marks buffers dirty.
 418  */
 419
 420 static void trans_go_drop_th(struct gfs2_glock *gl)
 421 {
 422         struct gfs2_sbd *sdp = gl->gl_sbd;
 423
 424         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 425                 gfs2_meta_syncfs(sdp);
 426                 gfs2_log_shutdown(sdp);
 427         }
 428 }
 429
 430 /**
 431  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
 432  * @gl: the glock
 433  *
 434  * Returns: 1 if it's ok
 435  */
 436
 437 static int quota_go_demote_ok(struct gfs2_glock *gl)
 438 {
 439         return !atomic_read(&gl->gl_lvb_count);
 440 }
 441
 442 const struct gfs2_glock_operations gfs2_meta_glops = {
 443         .go_xmote_th = meta_go_sync,
 444         .go_drop_th = meta_go_sync,
 445         .go_type = LM_TYPE_META,
 446 };
 447
 448 const struct gfs2_glock_operations gfs2_inode_glops = {
 449         .go_xmote_th = inode_go_xmote_th,
 450         .go_xmote_bh = inode_go_xmote_bh,
 451         .go_drop_th = inode_go_drop_th,
 452         .go_inval = inode_go_inval,
 453         .go_demote_ok = inode_go_demote_ok,
 454         .go_lock = inode_go_lock,
 455         .go_unlock = inode_go_unlock,
 456         .go_type = LM_TYPE_INODE,
 457         .go_min_hold_time = HZ / 10,
 458 };
 459
 460 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 461         .go_xmote_th = meta_go_sync,
 462         .go_drop_th = meta_go_sync,
 463         .go_inval = meta_go_inval,
 464         .go_demote_ok = rgrp_go_demote_ok,
 465         .go_lock = rgrp_go_lock,
 466         .go_unlock = rgrp_go_unlock,
 467         .go_type = LM_TYPE_RGRP,
 468         .go_min_hold_time = HZ / 10,
 469 };
 470
 471 const struct gfs2_glock_operations gfs2_trans_glops = {
 472         .go_xmote_th = trans_go_xmote_th,
 473         .go_xmote_bh = trans_go_xmote_bh,
 474         .go_drop_th = trans_go_drop_th,
 475         .go_type = LM_TYPE_NONDISK,
 476 };
 477
 478 const struct gfs2_glock_operations gfs2_iopen_glops = {
 479         .go_type = LM_TYPE_IOPEN,
 480 };
 481
 482 const struct gfs2_glock_operations gfs2_flock_glops = {
 483         .go_type = LM_TYPE_FLOCK,
 484 };
 485
 486 const struct gfs2_glock_operations gfs2_nondisk_glops = {
 487         .go_type = LM_TYPE_NONDISK,
 488 };
 489
 490 const struct gfs2_glock_operations gfs2_quota_glops = {
 491         .go_demote_ok = quota_go_demote_ok,
 492         .go_type = LM_TYPE_QUOTA,
 493 };
 494
 495 const struct gfs2_glock_operations gfs2_journal_glops = {
 496         .go_type = LM_TYPE_JOURNAL,
 497 };
 498